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9. Flow Chart of Troubleshooting
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9-1
9-1. Power On
C424(VREG_MSME)=1.8V?
C423(VREG_MSMP)=2.6V?
C422(VREG_MSMA)=2.6V?
C418(VREG_TCXO)=2.8V?
Yes
Check the initial operation
Yes
No
Check the clock generation circuit
(related to TCX100)
Check for the clock at C435
= 19.2MHz
Yes
No
Check the U401
Yes
END
Yes
No
Check the U401
L400(VREG_MSMC)=1.2V?
Yes
No
Resolder OSC400
Check the Clock at
OSC400=32.768KHz
Yes
No
Check the U401 related to PS_HOLD
U401 pin F10(PS_HOLD)
= 2.6V?
Yes
No
Change the Battery
' Power On ' does not work
Check the Battery Voltage
is more than 3.4V
Summary of Contents for SGH-F490
Page 79: ...8 PCB Diagrams 8 1 1 Main top ...
Page 80: ...PCB Diagrams 8 2 2 Main bottom ...
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